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公开(公告)号：JPH07318183A
公开(公告)日：1995-12-08
申请号：JP10543494
申请日：1994-05-19
Applicant: MATSUSHITA REFRIGERATION
Inventor： KIDO OSAO , TANIGUCHI MITSUNORI
IPC: F25B13/00
Abstract: PURPOSE:To improve the performance of a heat exchanger for a heat pump air conditioner corresponding to a non-azeotropic mixture refrigerant known recently as a candidate of an alternate refrigerant for preventing an ozone layer from being destroyed with respect to a heat exchanger which is used for a heat pump air conditioner serving as both cooling and heating and which performs delivery of heat between a refrigerant and a fluid such as air. CONSTITUTION:A flow of a refrigerant flowing through a heat transfer tube 4 is directed in the direction opposite on the average to that of an air stream Hereby, when a non-azeotropic mixture refrigerant is used as the refrigerant, both evaporation process and condensation process can take on the average a temperature difference between the refrigerant and the air stream to be greater, and hence the amount of heat exchange is prevented from being lowered owing to the use of the non-azeotropic mixture refrigerant.
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公开(公告)号：JPH05322471A
公开(公告)日：1993-12-07
申请号：JP13322392
申请日：1992-05-26
Applicant: MATSUSHITA REFRIGERATION
Inventor： KIDO OSAO , TANIGUCHI MITSUNORI
IPC: F28F1/40
Abstract: PURPOSE:To improve the heat transfer rate between refrigerant and a heat transfer tube in a heat exchanger with fins in which heat is transferred between the refrigerant for an air conditioner, a refrigerator, an automobile equipment, etc., and fluid such as the air, etc. CONSTITUTION:A lead angle of a groove 7a of a heat transfer tube 6a of an air upstream side is reduced as compared with that of a groove 7b of a heat transfer tube 6b of an air downstream side thereby to reduce liquid refrigerant flowing over the groove 7a in the tube 6a of the upstream side having a large heat exchanging amount. A turning force due to a large lead angle of the tube 6b of the downstream side having a small heat exchanging amount is utilized to expedite a reduction in thickness of a thin film of liquid refrigerant, heat transfers of the refrigerants of both the tubes 6a and 6b on the upstream and downstream side are enhanced to maximum limit, thereby expediting heat transfer of the refrigerant in an entire heat exchanger.
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公开(公告)号：JPH05172484A
公开(公告)日：1993-07-09
申请号：JP34276291
申请日：1991-12-25
Applicant: MATSUSHITA REFRIGERATION
Inventor： KIDO OSAO
Abstract: PURPOSE:To maintain the improvement of a heat transfer rate between refrigerant and a boiling heat transfer surface, suppress a fluidizing loss and improve a pressure resistant strength and a manufacturing speed in the transfer surface of the refrigerant side to be used for a heat exchanger for delivering heat between the refrigerant and fluid such as the air for an air conditioner, a refrigerator, automotive apparatuses, etc. CONSTITUTION:The boiling heat transfer surface comprises a plurality of bandlike water repellant surface treated materials 8 continued in an oblique direction to a refrigerant flowing direction on the surface. Thus, since the thickness of the material 8 is considerably smaller than a groove of a conventional example while maintaining a high heat transfer rate between refrigerant and the boiling heat transfer surface 7, ruggedness of the surface of the surface 7 is small, and a resistance of a flowing passage is not increased like the groove.
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公开(公告)号：JPH0510695A
公开(公告)日：1993-01-19
申请号：JP16273891
申请日：1991-07-03
Applicant: MATSUSHITA REFRIGERATION
Inventor： KIDO OSAO
Abstract: PURPOSE:To remarkably improve a heat transfer rate between refrigerant flowing in a passage in a tube and inner periphery in the tube and to improve performance of a heat exchanger by using a boiling heat transfer tube used for the exchanger to deliver heat between the refrigerant and fluid such as the air for an air conditioner, a refrigerator, an automotive device, etc. CONSTITUTION:Parallel grooves 10 continued substantially parallel to an axial direction (n) of a tube, are provided on the top and the bottom of the inner periphery 8a of the tube, and oblique grooves 11a continued obliquely to the axial direction (n) of the tube, are provided on the side of the periphery 8a of the tube. Further, the pitch P of the grooves 10 is formed larger than the pitch P of the grooves 11, the pitch P of the grooves 10 is set to 0.15-0.25mm, and the depth H of the groove is set to 0.15-0.25mm.
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公开(公告)号：JPH04283398A
公开(公告)日：1992-10-08
申请号：JP4475491
申请日：1991-03-11
Applicant: MATSUSHITA REFRIGERATION
Inventor： KIDO OSAO
IPC: F28F1/40
Abstract: PURPOSE:To improve the performance of a heat-exchanger using the title conduit, by a method wherein on the title conduit used for the heat-exchanger transferring heat between a refrigerant used for an air-conditioner, a refrigerating, apparatus, an automotive apparatus, or the like and a fluid, such as the air, a heat transfer rate between the refrigerant flowing in the title conduit and an inner surface therein is considerably improved. CONSTITUTION:Trapezoidal grooves 8 arranged without gap in parallel or inclining to axial direction n of the title conduit are formed on an inner surface 6a therein. With regard to the sectional shape of the grooves 8, a groove pitch P is made 0.2mm, the ratio of the groove pitch P to a maximum inner diameter D of the conduit is 0.03 and the ratio of the groove pitch P to a groove depth H, 0.1. In this way, an effective area for transferring heat, at which a liquid refrigerant is in contact with the inner surface 6a therein, is greatly increased since a liquid refrigerant film shape formed on the grooves 8 by surface tension is optimized, and the lead angle of the grooves 8 to the axial direction n thereof is zero degree.
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Patent Agency Ranking
公开(公告)号：JPH03251689A
公开(公告)日：1991-11-11
申请号：JP4762890
申请日：1990-02-28
Applicant: MATSUSHITA REFRIGERATION
Inventor： NAKAYAMA KOICHI , IDE SHINICHI , KIDO OSAO
Abstract: PURPOSE:To promote turbulent flow in a pipe and improve heat transfer efficiency by a method wherein the heat transfer tube is provided with the spiral grooves of bell type grooves, whose opening is narrowed, and the spiral grooves of V-shape grooves alternately on the inner surface thereof upon expanding the pipe, in which heat transfer fins are brought into close contact with the heat transfer tube. CONSTITUTION:A heat exchanger is constituted of heat transfer fins, arranged in parallel with a given interval, and heat transfer tubes 11, inserted orthogonally to the heat transfer fins and provided with spiral grooves on the inner surface thereof. The section of the heat transfer tube 11 constituted of substantially M-shape crests 12 and substantially rectangular grooves 13, formed by the crests 12, which are worked so as to be spiral. The section of the heat transfer tube 11 after expanding, in which the heat transfer fins are brought into close contact with the heat transfer tube 11, is formed of crests 14, deformed from the crests 12, V-shape grooves 15, formed at the central part of the crests 14, and bell-type grooves 16 deformed from the crests 12. According to this method, turbulent flow in the tubes is promoted and heat transfer between the inner wall of the heat transfer tube and refrigerant is unified whereby the performance of the heat exchanger can be improved.
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公开(公告)号：JPH0363499A
公开(公告)日：1991-03-19
申请号：JP19900389
申请日：1989-07-31
Applicant: MATSUSHITA REFRIGERATION
Inventor： KASE HIROAKI , KIDO OSAO , KOMA HACHIRO
IPC: F28F1/32
Abstract: PURPOSE:To improve a dropping of water drpplets condensed at fins and restrict an increasing of aeration resistance of air flow and a decreasing of a thermal transmitting efficiency by a method wherein some space holding pieces having a wider width of an extreme end than that of a root part are positioned at a rear part of a thermal transmitting pipe in respect to a direction of air flow and further applied as projections in parallel with a direction of their gravities. CONSTITUTION:Some space holding pieces 12 having wider cut and raised end edges than widths of roots and further having widths of the cut and raised end edges smaller than a width of a thermal transmitting pipe at several fins 11 arranged at a specified spacing are positioned at a rear part of the thermal transmitting pipe in respect to an air flow and formed as projections in parallel with a direction of their weight. The heat exchanger having fins is used as an evaporator and in case that water droplets are condensed at an outer surface of the evaporator, the space holding pieces 12 are in parallel with their weighing directions, so that no water droplets are accumulated and when the condensed water droplets are dropped below the heat exchanger by their own weights, the spacing holding pieces 12 do not make any troubles to improve a dropping of the water droplets, and increasing of the aeration resistance of the air flow and a reduction of a thermal transmitting efficiency of the air flow are restricted.
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公开(公告)号：JPH0363497A
公开(公告)日：1991-03-19
申请号：JP19775289
申请日：1989-07-28
Applicant: MATSUSHITA REFRIGERATION
Inventor： KIDO OSAO
Abstract: PURPOSE:To make a uniform covering of a circumference of a rectangular flow passage with liquid refrigerant through its capillary phenomenon, increase an actual thermal transmit ting area and improve a heat exchanging efficiency by a method wherein a partition wall is arranged within a pipe, a plurality of rectangular flow passages are formed, and a flow passage sectional area of each of the rectangular flow passages is limited to have a value less than a predetermined value. CONSTITUTION:A thermal transmitting pipe 7 having a flat sectional shape is provided with a plurality of rectangular flow passages 10 within it together with a circumferential wall 8 and a partition wall 9 within the pipe and at the same time a flow passage sectional area of each of the rectangular flow passages 10 (= a flow passage width W X a flow passage height H) is set less than 1.2mm . The thermal transmitting pipe 7 is generally used as a part of a heat exchanger. The heat exchanger is comprised of thermal transmitting pipes 7 and some corrugated fins 6 arranged between the thermal transmitting pipes 7. A heat exchanging operation is carried out between an air flow A flowing between the fins 6 and a refrigerant R flowing within the thermal transmitting pipes 7. In the case that the thermal transmitting pipes 7 are used as an evaporator and the refrigerant R is evaporated within the rectangular flow passage 10, the liquid refrigerant (r) ascends along the partition wall 9 due to its capillary action, so that the refrigerant may uniformly cover the wall surface around the rectangular flow passage 10 and thus a heat exchanging efficiency between the refrigerant R and the thermal transmitting pipes 7 is improved due to an increased actual thermal transmitting area.
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公开(公告)号：JPH0331665A
公开(公告)日：1991-02-12
申请号：JP16599889
申请日：1989-06-28
Inventor： AOYANAGI OSAMU , AOKI AKIRA , KIDO OSAO , KASE HIROAKI , NAKAMURA TAKASHI
Abstract: PURPOSE:To enable uniform diversion of a refrigerant through optimization of the shape of the space part of the interior of a container by a method wherein an approximate columnar member is inserted in a flow diverter, and the length of the insertion part of a heat transfer pipe is regulated. CONSTITUTION:A refrigerant entering in a gas liquid two-phase state from the side A flows through an inflow pipe 5. After it enters the interior B of s flow diverter 1 on the inlet side, it is branched into a plurality of heat transfer pipes 3, and guided to the vaporizer side C. The refrigerant absorbs heat in the vaporizer and enters a flow diverter on the outlet side in a gas phase state from the side C. After the diversified refrigerants are joined together at the interior D of the flow diverter 2 on the outlet side, it is guided through an outflow pipe 6 to the side E. A volume velocity is low in the flow diverter 1 on the inlet side where dryness is generally low, a gap phase and a liquid phase are separated into upper and lower parts by the influence of gravity. By decreasing the sectional area of the flow passage of the interior B of the flow diverter by means of insertion members 7a, the volume velocity is increased, and by agitating together gas and liquid, the refrigerant can be diverted uniformly. Since the refrigerant is in a gas phase state in a flow diverter 2 on the outlet side where dryness is high, the volume velocity is very high. Therefore, by decreasing the size of an insertion member 7b on the outlet side to a value lower than that of the insertion member 7a on the inlet side, incurring of a pressure loss in the flow diverter is suppressed.
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公开(公告)号：JPH0313794A
公开(公告)日：1991-01-22
申请号：JP14903489
申请日：1989-06-12
Inventor： KIDO OSAO , KASE HIROAKI , NAKAMURA TAKASHI , AOKI AKIRA , AOYANAGI OSAMU
Abstract: PURPOSE:To improve the falling of water droplets, and to inhibit the increase of the draft resistance of an air current and the lowering of a heat transfer rate by forming flat grooves at plural stages and composing reference cores of plate fins, on downstream-side surfaces of which drainage surfaces communicating in the stepped direction are shaped, and flat pipes inserted into the flat grooves from side faces. CONSTITUTION:Flat grooves 6 constituted by notching front edge sides in the direction of an air current are shaped at plural stages, reference cores 10 are composed of plate fins 5, on stream-side surfaces of which lower than the flat grooves 6 drainage surfaces 7 communicating in the stepped direction are formed, and flat pipes 8 inserted into the flat grooves 6 of the plate fins 5 from side faces, and a plurality of the reference cores 10 are arranged in the direction of the air current. Consequently, even when the heat exchanger with the fins is used as an evaporator and water droplets L condense on outside surfaces, water droplets L staying on the top faces of the flat pipes 8 are pushed by the air current A, moved to the downstream side, transmitted on the drainage surfaces 7 communicating in the stepped direction and can be dropped to lower steps. Accordingly, falling in the direction of gravity (g) of the water droplets L is improved, and the increase of the draft resistance of the air current A and the lowering of a heat transfer rate can be inhibited.
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